Observation of a peaking structure in the J / ψ ϕ mass spectrum from B ± → J / ψ ϕ K ± decays
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1-s2.0-S0370269314003657-main.pdf
Description
Published version
Size
816.45 KB
Format
Adobe PDF
Checksum (MD5)
96a1e7543d4e0f7f84ac2d9a9ac0bada
Author(s)
The CMS Collaboration
Date Issued
2014
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Chatrchyan, S., et al. "Observation of a Peaking Structure in the J/?f Mass Spectrum from B�?J/?fk� Decays." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 734 (2014): 261-81.
Version
Final published version
Abstract
A peaking structure in the J/ψφ mass spectrum near threshold is observed in B ±→J/ψφK± decays, produced in pp collisions at √s=7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/ψ, corresponds to an integrated luminosity of 5.2 fb-1. Fitting the structure to an S-wave relativistic Breit-Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m = 4148.0 ± 2.4 (stat.) ± 6.3 (syst.)MeV and Γ=28-11+15(stat.)±19(syst.)MeV, respectively. Evidence for an additional peaking structure at higher J/ψφ mass is also reported. © 2014 The Authors.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2014.05.055
